Composing a work for organ and orchestra is not an easy task, but celebrated Finnish composer Kaija Saariaho was up to the challenge in her new piece, Maan varjot (Earth's Shadows). Discover the collaborative process behind this new commission with this film featuring Kaija Saariaho and Esa-Pekka Salonen in conversation. Noted French organist, Olivier Latry, contributes his perspective and put the newly restored Southbank Centre organ through its paces.